Travellers who booked international flights with Korean Air during Dec 22-26 may need to look for alternative itineraries after a pilots' strike partly shut down overseas and domestic routes Saturday. The strike has halted 20 international flights departing Incheon International during the period. Destinations include Narita and Osaka in Japan, Hong Kong, Dubai in the United Arab Emirates, and cities in Saudi Arabia. The strike has stopped 64 domestic flights connecting airports at Gimhae, Ulsan, Yeosu, Jeju and Gimpo. But the airline ― designated an essential public service in 2010 ― says it will operate most flights, maintaining an operation rate of 97% in flights to Japan, China and the Middle East; 83% in domestic flights and 90% in freight transport. <br/>